Date of download: 7/8/2016 Copyright © ASME. All rights reserved. From: Voxelized Model of Brain Infusion That Accounts for Small Feature Fissures: Comparison With Magnetic Resonance Tracer Studies J Biomech Eng. 2016;138(5): doi: / MR images of rat brain. (a) AD map of a coronal brain slice (background was set to be black). (b) FA map of a coronal brain slice. (c) GA map of the same slice, with improved contrast between CSF and WM. Squares indicate the location of lacunosum-moleculare layer and circles indicate the location of molecular layer. Figure Legend:

Date of download: 7/8/2016 Copyright © ASME. All rights reserved. From: Voxelized Model of Brain Infusion That Accounts for Small Feature Fissures: Comparison With Magnetic Resonance Tracer Studies J Biomech Eng. 2016;138(5): doi: / Segmented brain volume: (a) voxelized brain model (impermeable regions, GM, WM, and CSF spaces); (b) segmentation of dorsal and ventral hippocampi slices without hippocampal fissures (NHF) and with fissures (HF). Atlas figures show location of fissures and CSF in thick lines. Labels indicate the location of the CA1, CA3, corpus callosum (CC), cerebral peduncle (CP), dorsal 3rd ventricle (D3V), dentate gyrus (DG), fimbria (FI), granule cell layer (GC), hippocampal fissure (HF), lateral ventricle (LV), midbrain cistern (MBC), subiculum (S), and velum interpositum (VI). Figure Legend:

Date of download: 7/8/2016 Copyright © ASME. All rights reserved. From: Voxelized Model of Brain Infusion That Accounts for Small Feature Fissures: Comparison With Magnetic Resonance Tracer Studies J Biomech Eng. 2016;138(5): doi: / Three-dimensional structure of the fluid-filled lateral ventricles. The fluid-filled space was shown as the bulge part along the sagittal tissue slice. Fissures connected to ventricles and other CSF spaces are also shown. Figure Legend:

Date of download: 7/8/2016 Copyright © ASME. All rights reserved. From: Voxelized Model of Brain Infusion That Accounts for Small Feature Fissures: Comparison With Magnetic Resonance Tracer Studies J Biomech Eng. 2016;138(5): doi: / Albumin tracer distribution volumes in CSF after CED. (Left) Simulations with hippocampal fissures and (right) no fissures for varying infusion volumes in (top) dorsal and (bottom) ventral hippocampus. The hydraulic conductivity of CSF ranged as K CSF /K WM ǁ from 10 to Figure Legend:

Date of download: 7/8/2016 Copyright © ASME. All rights reserved. From: Voxelized Model of Brain Infusion That Accounts for Small Feature Fissures: Comparison With Magnetic Resonance Tracer Studies J Biomech Eng. 2016;138(5): doi: / Albumin tracer distribution volumes in the brain (tissue and CSF) after CED. Tracer distribution volume in (left) dorsal and (right) ventral hippocampus for an infusion rate of 0.3 μl/min for fissures (HF) and no fissures (NHF). Figure Legend:

Date of download: 7/8/2016 Copyright © ASME. All rights reserved. From: Voxelized Model of Brain Infusion That Accounts for Small Feature Fissures: Comparison With Magnetic Resonance Tracer Studies J Biomech Eng. 2016;138(5): doi: / Simulated infusate distribution volume in different tissue regions for CED in dorsal and ventral hippocampus. (Left) Volume percentage of tracer in WM, GM, and CSF in HF model. (Right) Volume percentage of tracer in WM, GM, and CSF in NHF model. (Top) In dorsal hippocampus and (bottom) in ventral hippocampus. The infusion rate was 0.3 μl/min. Figure Legend:

Date of download: 7/8/2016 Copyright © ASME. All rights reserved. From: Voxelized Model of Brain Infusion That Accounts for Small Feature Fissures: Comparison With Magnetic Resonance Tracer Studies J Biomech Eng. 2016;138(5): doi: / Comparison of experimentally measured DCE-MRI distributions with predicted CED into the dorsal hippocampus. (Top) DCE-MRI measured distribution (column 1) and measured concentration profiles (column 2) with simulated tracer distributions from the HF model (column 3) and the NHF model (column 4). Different rows show concentration contours from anterior to posterior regions. Albumin of 7.35 μl (and Gd-albumin) tracer was infused at 0.3 μl/min. (Bottom) Comparison of tracer distribution area calculated in consecutive MR imaging slices. Area spread is based on a 5% normalized concentration (C/ ϕ C0) threshold. Filled triangles and circles show an adjusted distribution range that accounts for tissue shrinkage in the model geometry (+7.64%). Figure Legend:

Date of download: 7/8/2016 Copyright © ASME. All rights reserved. From: Voxelized Model of Brain Infusion That Accounts for Small Feature Fissures: Comparison With Magnetic Resonance Tracer Studies J Biomech Eng. 2016;138(5): doi: / Comparison of experimentally measured DCE-MRI distributions with predicted CED into the ventral hippocampus. (Top) DCE-MRI measured distribution (column 1) and measured concentration profiles (column 2) with simulated tracer distributions of HF model (column 3) and NHF model (column 4) through concentration contour for infusions into ventral hippocampus form anterior to posterior in rows. CED of 7.35 μl of albumin (and Gd-albumin) tracer was infused at 0.3 μl/min. (Bottom) Comparison of tracer distribution area calculated in consecutive MR imaging slices. Area spread is based on a 5% normalized concentration (C/ ϕ C0) threshold. Filled triangles and circles show an adjusted distribution range that accounts for tissue shrinkage in the model geometry (+7.64%). Figure Legend:

Date of download: 7/8/2016 Copyright © ASME. All rights reserved. From: Voxelized Model of Brain Infusion That Accounts for Small Feature Fissures: Comparison With Magnetic Resonance Tracer Studies J Biomech Eng. 2016;138(5): doi: / CED distribution of albumin tracer in dorsal hippocampus with increasing infusion volume. (Top) DCE-MRI measured distribution (column 1) and measured concentration profiles (column 2) with simulated tracer distributions of HF model (column 3) and NHF model (column 4) for varying infusion volumes: (row 1) V i = 1.05 μl, (row 2) V i = 3.15 μl, (row 3) V i = 5.25 μl, and (row 4) V i = 7.35 μl. Infusions were at 0.3 μl/min. (Bottom) Comparison of tracer distribution area calculated in the infusion slice of the dorsal hippocampus. Area spread is based on a 5% normalized concentration (C/ ϕ C0) threshold. Filled triangles and circles show an adjusted distribution range that accounts for tissue shrinkage in the model geometry (+7.64%). Figure Legend:

Date of download: 7/8/2016 Copyright © ASME. All rights reserved. From: Voxelized Model of Brain Infusion That Accounts for Small Feature Fissures: Comparison With Magnetic Resonance Tracer Studies J Biomech Eng. 2016;138(5): doi: / CED spread of albumin tracer into the ventral hippocampus with increasing infusion volume. (Top) DCE-MRI measured distribution (column 1) and measured concentration profiles (column 2) with simulated tracer distributions of HF model (column 3) and NHF model (column 4) for varying infusion volumes: (row 1) V i = 1.05 μl, (row 2) V i = 3.15 μl, (row 3) V i = 5.25 μl, and (row 4) V i = 7.35 μl. Infusions were at 0.3 μl/min. (Bottom) Comparison of tracer distribution area calculated in the infusion slice of the ventral hippocampus. Area spread is based on a 5% normalized concentration (C/ ϕ C0) threshold. Filled triangles and circles show an adjusted distribution range that accounts for tissue shrinkage in the model geometry (+7.64%). Figure Legend:

Date of download: 7/8/2016 Copyright © ASME. All rights reserved. From: Voxelized Model of Brain Infusion That Accounts for Small Feature Fissures: Comparison With Magnetic Resonance Tracer Studies J Biomech Eng. 2016;138(5): doi: / Comparison of calculated distribution volumes in a region after the end of CED into the dorsal (left) and ventral (right) hippocampus. Results from HF and NHF models are long bars. Adjusted distribution volumes are short bars stacked on top (+11.7%). Figure Legend: